our current first lady, michelle obama, has developed her role by leading the let's move campaign which tackles the challenge of childhood obesitobesity. if you have a question, send it to ask liz@nbcwashington.com. and have a great weekend. >> yes. >> going to be lovely. >> it is. >>> jim? >>> after the break, a man arrested in a brutal sex assault in central park, now police believe he might be responsible for the murder of a w >>> new information tonight about the man accused of raping a woman in new york central park. police say he has a lengthy criminal background, and that he may be connected to the murder of a west virginia woman. tracy strahan has the details. >> reporter: police say he raped an elderly woman in broad daylight. this shows him holding a backpack similar to the one stolen from his victim. he was questioned for hours until finally being charged. authorities found memory cards from his 73-year-old victim's camera on him. she says she caught mitchell exposing himself in an isolated area of the park days earlier, and angered him by snapping a photo. before wednesday's